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The Theia Hypothesis: New Evidence Emerges that Earth and Moon Were Once the Same

Birth_of_moon_3 According to the giant impact hypothesis, there was once a Mars-sized body referred to as Theia orbiting in our solar system. The planet was named after the Greek Titan who gave birth to the Moon goddess Selene—a fitting name considering that the planet Theia is thought to be responsible for the birth of our moon.

Theia would have formed in about the same orbit as Earth, but about 60° ahead or behind.  When the protoplanet had grown to be about the size of Mars, its size made it too heavy for its orbit to remain stable. As a result, its angular distance from Earth varied increasingly, until it finally it crashed into the Earth.

The collision would have occurred circa 4.533 billion years ago when Theia would have hit the Earth at an oblique angle, and destroyed herself in the process. Theia's mantle and a significant portion of the Earth's silicate mantle were thrust into space. The left over materials from Theia mixed with the materials from the Earth and eventually formed the Moon.

New research is validating this hypothesis, showing that the Earth’s core and the Moon’s core contain the same silicon isotopic material, which would support that the two were once a single body until a large impact separated them.

Scientists from Oxford University, University of California, and Swiss Federal Institute of Technology compared silicon isotopes from Earth rocks, as well as other materials from our solar system such as rocky materials from meteorites.

Up to about 2,900 kilometers (1,800 miles) into the Earth (not quite half way to the center), is what we know as the mantle and crust. They are predominantly formed of silicate, a compound mad of silicon, oxygen, and other elements. Past the halfway mark is a dense metallic iron material that makes up the Earth’s core.

The multinational team found that the heavier isotopes from silicate samples taken from the Earth consisted of increased amounts of the heavier isotopes of silicon. They found that Mars, the asteroid Vesta, and various chrondites (primitive meteorites that never produced ainner cores) do not contain such an arrangement, even though they have an iron core. is much smaller than the Earth (about one-eighth the size), so did not have enough mass to generate the pressure necessary to form the same core as found in the Earth.

On the other hand, the researchers found that the Moon did show a similar composition of the silicon isotopic composition as the Earth. However, it, too, is much smaller than the Earth—about one-fiftieth as large as the Earth and about one percent of the Earth’s mass—making it even less likely to have been able to generate enough pressure to form an Earth-like iron core.

However, such a core does exist at the center of the Moon, but no one can explain how it got there.

The researchers contend that the Moon indeed must have been created during a giant impact by a planet-size object (Theia) that hit during the early development of Earth. The impact was large enough that the materials, which eventually formed the Moon, mixed with the materials from the Earth, which already had a heavy silicon isotopic composition.

They state within their paper in the journal Nature: “The similar isotopic composition of the bulk silicate Earth and the Moon is consistent with the recent proposal that there was large-scale isotopic equilibration during the giant impact.”

This research is the first of its kind using isotopes in this manner and offers intriguing insights into the creation of Mars, the Earth, and the Moon. It may also help explain how life evolved on the Earth and whether or not it might have existed at some time on Mars.

Posted by Casey Kazan

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Spade work that makes it all seem so real.

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p.s. 2[squared]=4

DR. Mckensie informs us in his book of a large object named Theia, crashing into Earth, resulting in the great formation of which we call the Moon. There is another book which details a massive object impacting Earth. It goes much more in depth than Dr. Mckensie's Big Splat. The two books parallel on the identical subjects, yet the research in both books conclude avery similar result. The Cataclysmic Impact details much geologic evidence throughout Earth's surface of an enormous planetary impact. The 'Cataclysmic Impact' is contingent on a massive comet being the culprit for the emergence of the moon.

There remain several unanswered issues surrounding this hypothesis. Lunar oxygen isotopic ratios are essentially identical to Earth's, with no evidence of a contribution from another solar body.

The moon and the earth are so different and so similar at the same time. But I still wonder how you can make 2 big planet from one bigger !

Planet Theia is a spiraling planet that currently spirals towards earth. I now am informed that Theia is now out of exsistence. With this (Theia) being so close to Earth, Theia has now been dismantled and destroyed, and this has been confermed by NASA. Theia is NO MORE!

This has all been updated with sampling of the moon rock from the US astronauts trip there and back showing the existence of Theia.

I think the mechanical dynamics for this scenario is impossible. The isotopic similarity may be due o the fact that both bodies were a similar distance to the Sun and absorbing the same amount of isotopes at the same rate. But if the Earth has been in a constant state of evolution for most if its life and the Moon essentially dead how can the Isotopic composition still be similar after billions of years?

Thank you so much know i can ace my science test

this really helped for a research project. thanks for the awesome science info. daily galaxy for the win!

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